Kukuczka J. Roman Stopa’s Unknown Photographs. Sketching a Portrait of the Khoisan Peoples . 89. In: Kłosowicz R , ed. Pioneers of African Studies in Kraków: In Memory of Professor Roman Stopa (1895-1995). Księgarnia Akademicka Publishing; 2020:89-110. doi:10.12797/9788381382359.04